Bullnose drywall casing meets backsplash

Im redoing my kitchen. I took it down to the studs and installed a 36 inch window centered above where the sink will be. Im going to make a granite window sill.

The top 23 inches or so of the window casing will be drywall with bullnose corners. Im going to do a full 18 inch backsplash inbetween the upper cab's and the counter. This backsplash will wrap around forming the lower foot of the window casing. Where tile meets tile on the window casing will make a perfect 90. This 90 up against the bullnose corner of the drywall will leave an unsightly gap thats boggling my mind. I though about using a bullnose to 90 transition corner designed for baseboard but I dont like the look. Only other thing I can think would be some caulking or some grout which isn't too appealing either.

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Bullnose drywall casing meets backsplash

Pretty common problum that's going to require compromise.
Use bull nose tile (the 2" wide not the base cap) as a casing, or use real wood casing held back away from the radis, keep your tile below the window stool.

Bullnose drywall casing meets backsplash

Cons,
why not just stop the tile short of the bullnose radius in the wall and use a tile with a finished edge (bullnose tile)? In other words, don't wrap the lower jamb with tile. How bout some pics?
Mike Hawkins